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The six Celtic nationalities are divided into two musical groups, Gaelic and Brythonic,[1] which according to Alan Stivell differentiate "mostly by the extended range (sometimes more than two octaves) of Irish and Scottish melodies and the closed range of Breton and Welsh melodies (often reduced to a half-octave), and by the frequent use of the pure pentatonic scale in Gaelic music".[2]

The session is a common setting for Gaelic music, where musicians from a given locality gather to play music in a public setting. Gaelic music is also commonly heard at folk festivals, by pipe bands and at competitions such as mods and the Fleadh Cheoil.

Unlike Classical and Jazz music, Gaelic triad avoids diminished chords, as seen below for the seventh scale degree of the major scale.[8] Seventh chords are generally limited to the II and the V positions of the chord scale.